摘要
以载荷试验得到的荷载~沉降数据为基础,分析了4种数据归一化方法对荷载~沉降曲线拐点位置的影响,探讨了由荷载~沉降曲线求解极限承载力的3种方法,求解了其拟合参数的概率统计特征。研究表明：采用双曲线模型可以较好地拟合载荷试验得到的荷载~沉降数据。根据荷载~沉降曲线,采用拐点法、沉降法及参数法求得的承载力依次增大,求解极限承载力较好的方法是沉降法。若想准确得到荷载~沉降曲线的拐点位置,应首先对荷载及沉降同时进行归一化,然后进行曲线拟合。采用双曲线模型拟合荷载~沉降曲线时,两个拟合参数间存在较强的负相关性。
This paper presents a method of estimating the ultimate bearing capacity of soils using the load-settlement curve. Four different data normalization methods are used in the data processing in order to discuss the effect of each method on the location of the curve inflection point. In addition, three methods that are used in the ultimate capacity estimation are investigated and the statistical characterization of each curve fitting method is also discussed. The results indicate that, the hyperbolic curve model can better fit the tested load-settlement data. For a set of data, the ultimate bearing capacity values obtained by curve in- flection method, settlement curve fitting method and parameter method are increasing. The best method is settlement curve fit- ting method. If the accurate location of the inflection point needs to be determined, the normalization of the tested data is neces sary. Then, the curve fitting method can be applied. The probabilistic analysis shows that there are strong negative correlation between the two curve fitting parameters of hyperbolic model of load-settlement curves.
出处
《土工基础》
2016年第3期333-336,共4页
Soil Engineering and Foundation
关键词
承载力
曲线拟合
桩基
载荷试验
荷载~沉降曲线
Ultimate Bearing Capacity
Curve Fitting
Pile Foundation
Load Test
Load-Settlement Curve
